18695459681 has 4 divisors (see below), whose sum is σ = 18705911700. Its totient is φ = 18685007664.

The previous prime is 18695459647. The next prime is 18695459689.

18695459681 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17987101456 + 708358225 = 134116^2 + 26615^2 .

It is a cyclic number.

It is not a de Polignac number, because 18695459681 - 2⁶ = 18695459617 is a prime.

It is a super-2 number, since 2×18695459681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18695459689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5223326 + ... + 5226903.

It is an arithmetic number, because the mean of its divisors is an integer number (4676477925).

Almost surely, 2^18695459681 is an apocalyptic number.

It is an amenable number.

18695459681 is a deficient number, since it is larger than the sum of its proper divisors (10452019).

18695459681 is a wasteful number, since it uses less digits than its factorization.

18695459681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10452018.

The product of its digits is 18662400, while the sum is 62.

The spelling of 18695459681 in words is "eighteen billion, six hundred ninety-five million, four hundred fifty-nine thousand, six hundred eighty-one".